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ACR321 - User Manual
Version 1.00
Page 9 of 11
www.acs.com.hk
Signal
Signal Name
Signal Description
Signal Level
1
RS232/485
Port 1: 3.3V or open->RS232, 0V-> RS485
3.3V logic
2
TXD1
RS232 Port 1, Data Transmit
RS-232 signal standard
3
RXD1
RS232 Port 1, Data Receive
RS-232 signal standard
4
RS485-A
RS485 Non-inverting, Port 1
RS485 signal standard
5
RS485-B
RS485 Inverting, Port 1
RS485 signal standard
6
GND
Digital Ground
Digital Ground for Serial port interface
7
TXD2
RS232 Port 2, Data Transmit
RS-232 signal standard
8
RXD2
RS232 Port 2, Data Receive
RS-232 signal standard
9
GND
Digital Ground
Digital Ground for Serial port interface
10
N.C.
No connection
11
N.C.
No connection
12
N.C.
No connection
13
N.C.
No connection
14
N.C.
No connection
15
Reserved
(Don't connect)
16
N.C.
No connection
17
N.C.
No connection
18
N.C.
No connection
19
Reserved
(Don't connect)
20
Reserved
(Don't connect)
21
Reserved
(Don't connect)
22
Reserved
(Don't connect)
23
OUTPUT-8
OUTPUT port 8
3V/5V Logic Level
24
OUTPUT-7
OUTPUT port 7
3V/5V Logic Level
25
OUTPUT-6
OUTPUT port 6
3V/5V Logic Level
26
OUTPUT-5
OUTPUT port 5
3V/5V Logic Level
27
N.C.
No connection
28
N.C.
No connection
29
N.C.
No connection
30
N.C.
No connection
